Horn (acoustic)

Abstract: A surgical ultrasonic horn (1) used in a surgical operation comprises a horn body (11) and an end plate portion (12). Cutting portions (121) are provided on an edge and an end of the end portion. A passage (21) for irrigation solution extends in the horn body and the end plate portion. At least one bore (124) opens at the cutting portions by a jet angle (β) of 5° to 90° in respect of a plane of the end plate portion. The irrigation solution passage communicates with the bore, thereby the irrigation solution is sprayed therethrough.

Abstract: A horn (12) connectable to an energy source (88) to amplify ultrasound displacement is connected to a transmitter (14) formed of material having relatively high mechanical Q for transmitting ultrasonic energy therethrough at a frequency f, the transmitter having a horn-shaped configuration of length that is a multiple of a half-wavelength μ/2, and preferably this horn-shaped configuration is comprised of multiple horn segments (16a and 16b) each of a length substantially equal to a multiple of μ/2, where μ = c/f (c is the speed of sound in the high Q material). The transmitter has a proximal end of cross-sectional diameter D1 connected to the horn and a distal end of cross-sectional diameter D2, where D1 > D2. Ultrasonic energy transmitted through the transmitter drives a tip which is coupled to the transmitter by means of a flexible connector (20).

Abstract: A horn antenna with a cylindrical and an expanded (horn-shaped) waveguide for radiating or receiving polarized electromagnetic waves. The waveguide wall is partially or wholly covered with one or more grids (12) of electrical conducting material with dielectric layers between them. One possible design consists of a tapering (e.g., conical) core (10) of compact dielectric, which allows for the possibility of shaping the terminal surface (13) to a lens which curves the course of radiation in the aperture to the desired radiation graph. Another possible design where the horn wall consists of dielectric covered with metal grids has an especially light construction. The wall surfaces are developed with anisotrope and reactive impedance so that it mainly functions in the same way as a corrugated horn and thus gives low cross-polarizations across a large frequency area. This could be constructed with little weight and could easily be mass-produced. This will be easier to produce than corrugated horn, especially in the millimeter-wave area.

Abstract: An ultrasonic rotary horn intended to be excited at a frequency of from about 18 to about 60 kHz, which horn is a shaped, solid metal object having a rotational axis and a radial surface terminated by a first end and a second end. The horn is radially symmetrical. The thickness of the horn at the rotational axis is greater than the width of the horn at the radial surface. The diameter, width, and thickness of the horn are selected for a desired frequency so that the horn, upon being excited by ultrasonic energy at such frequency which is input at the rotational axis at, and substantially perpendicular to, one or both ends, is adapted to resonate in a manner such that: (1) the excited end moves substantially in phase with the movement of the source of excitation; (2) the opposing end, whether or not it is actively excited, moves substantially out of phase with the movement of the excited end; (3) the radial work-contacting surface also moves substantially out of phase with the movement of the excited end; and (4) the horn exhibits a single nodal point at its geometric center; In addition, the first end and the second end have a substantially convex configuration which comprises a central, circular, flat portion which is concentric with the rotational axis and a generally concave portion from the flat portion to said radial surface.

Abstract: A disposable aspiration sleeve for use with an ultrasonic handpiece, which ultrasonic handpiece includes an ultrasonic horn wherein the cylindrical aspiration sleeve, which is provided with a vacuum tube coupling nipple, is removably mounted at its base to the handpiece and is provided with a supporting mount or mounts on its interior surface positioned in such a manner that the supportive mount or mounts each touches the horn at a vibratory node, thereby acoustically isolating the interior wall portion of the cylindrical sleeve from the ultrasonic horn or tip member. The addition of an aspiration sleeve with supporting mount or mounts positioned to rest upon the ultrasonic horn at one or more vibrational nodes enables the use of inexpensive plastic for construction, provides the necessary acoustical isolation for maximization of energy transfer to the tip of the ultrasonic horn, prevents transmission of ultrasonic energy from the horn to surrounding tissue, and creates an annular conduit between the sleeve and the horn for tissue aspiration which cannot be occluded by the sleeve touching the ultrasonic horn.